True & Co to PrimaDonna bra size

The short answer

True & Co XL is PrimaDonna 90C by the two brands' own charts.

Cups are counted along each brand's own letter order, and the band is carried across unchanged.

Every True & Co size read across to PrimaDonna. Brand's own sizes on the left, EU on the right.
True & Co	True & Co builds it for	PrimaDonna, by chart	Same label	PrimaDonna builds it for	PrimaDonna also prints
XS	not published	70C	not published	not published	UK C · US C
S	not published	75C	not published	not published	UK C · US C
M	not published	80C	not published	not published	UK C · US C
L	not published	85C	not published	not published	UK C · US C
XL	not published	90C	not published	not published	UK C · US C
1X	not published	95C	not published	not published	UK C · US C
2X	not published	100C	not published	not published	UK C · US C
3X	not published	105C	not published	not published	UK C · US C

Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

True & Co size guide, read on 2026-09-18. True & Co on TrueToSize
PrimaDonna size guide, read on 2026-09-18.

PrimaDonna to True & Co